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根据漂珠的组分及漂珠低密度水泥浆的性能特点，提出了漂珠水泥浆密度设计要求，减轻剂加量计算，适合漂珠低密度的水泥浆配方以及固井施工注意事项。在低压漏失层固井中还应加强以下工作：①确定合理的水泥浆密度，建立一套漂珠的不同加量、不同水灰比下的漂珠低密度水泥浆在不同液柱压力下的密度变化曲线，为确定低密度水泥浆密度提供可靠依据，特别是对密度很敏感的漏失层固井。②制定低密度水泥固井质量标准，低密度水泥的强度一般低于纯水泥、结构不如纯水泥致密、强度发挥不如纯水泥快。对低密度水泥固井应以保证水泥石的最低封隔质量为依据确定合理的低密度水泥固井质量标准。

RESEARCH ON WELL CEMENTING TECHNIQUE FOR PEAR DRIFTING LIGHTWEIGHT CEMENT

??According to the characteristics of pear-drifting component and pear-drifting lightweight slurry,the design requirements of pear-drifting slurry density,the formulation suiting to the pear-drifting lightweight slurry by calculating the increment of alleviation agent and the points for attention while well cementing are proposed out.The jobs while well cementing in low pressure leakage formation,such as ??setting up a set of varous pear-drifting increments,a set of density change curves of the pear-drifting lightweight slurry with various water-cement ratio under various liquid column pressure to provide a reliable basis for determining reasonable lightweight slurry density,??working out a set of well cementing quality standards with light weight cement are should be strengthened.In general,lightweight cement indensity is lower than that of net cement,its structure is not compact as that of net cement and its indensity demonstration is lower than that of net cement.The reasonable well cementing quality standards should be taken the lowest pack quality of lightweight cement as the basis.